Can Dogs Swim in Salt Water Pools?

Yes, dogs can swim in salt water pools, and swimming is generally fine. The concern is dogs drinking the water. Hill’s Pet, the only one of our sources that addresses salt pools directly, says small amounts mostly cause diarrhea at worst, while larger amounts can cause serious harm. Keep fresh water nearby and stop your dog drinking from the pool.

This page is part of our salt water pools hub. For the full list of what is and is not risky about salt pools, see dangers of salt water pools.

Two sources, two different waters

Most advice about dogs and salt water mixes up two different things: ocean water and salt pool water. Our two veterinary sources split the same way.

• Hill’s Pet writes about dogs drinking pool water, including saltwater pools. It is the only source we have that addresses salt pools directly. It names no veterinarian.
• The American Kennel Club writes about dogs drinking salt water at beaches, meaning ocean water. It quotes a veterinarian, Heather Loenser, DVM. It says nothing specific about salt pools.

We use both, but we keep them apart. Hill’s tells you about your pool. AKC tells you what salt water poisoning looks like at the far end, in water that is much saltier.

What Hill’s says about salt pools

Hill’s is direct about saltwater pools: “too much of it can still be bad for your dog (and potentially give them salt water poisoning).” For small amounts, Hill’s says “the worst they’ll experience is diarrhea”. For larger amounts, it lists “vomiting, seizures, brain damage and kidney damage.”

Its advice is practical: “keep plenty of fresh drinking water nearby for your pup, and redirect them if you notice them drinking from the pool.”

Hill’s also covers regular chlorine pools. Small swallowed amounts are generally fine there, but a dog drinking pool water to quench its thirst “can irritate their gastrointestinal tract and cause stomach discomfort and vomiting.” A salt pool is a chlorine pool too, so that applies on top of the salt.

What AKC says about ocean water

AKC explains that salt water a dog swallows “draws water from the blood into the intestines, leading to diarrhea, vomiting, and dehydration.” Signs it lists are vomiting within hours, then “weakness, diarrhea, muscle tremors, or seizures,” along with confusion and lethargy. Its most serious line is that “Dogs with toxic levels of sodium in their systems have a mortality rate higher than 50%, regardless of treatment.”

Remember that AKC is describing dogs at the beach. That mortality line is about toxic sodium levels, which AKC discusses in the context of ocean water, not pool water.

How much saltier is the ocean?

NOAA puts seawater at about 35 parts per thousand, which is about 35,000 ppm. Hayward’s manual gives 3,200 ppm as the ideal salt level for a salt pool.

35,000 / 3,200 = about 10.9, so the ocean is roughly eleven times saltier than a salt pool.

That gap explains why Hill’s expects small amounts of pool water to cause diarrhea at worst. It does not make pool water safe to drink freely. Hill’s is clear that too much can still cause salt water poisoning.

Is there a safe amount?

Our sources give no safe amount. Neither Hill’s nor AKC publishes a volume or a dose by body weight that is fine. We are not going to invent one.

Rationing would not work anyway. You cannot measure how much water a dog takes in while it paddles, fetches a toy off the surface or snaps at the splashes. A dog that swims for a long session on a hot day may also be thirsty, and the pool is the closest water it can reach. Some swallowing while swimming is hard to avoid. Drinking from the pool on purpose is the part you can stop.

So the answer is to prevent drinking, not to ration it. In practice, that means following both sources’ advice:

• Put a bowl of fresh water by the pool. AKC says to “make sure they always have access to fresh water.”
• Watch your dog in and around the water, and redirect it if it starts drinking from the pool, as Hill’s advises.
• Offer fresh water during breaks, so a thirsty dog is not tempted by the pool.

What a dog does to the pool

The pool side matters too. The CDC says chlorine combines with sweat, dirt, skin cells and other material that washes off swimmers to form chloramines. The CDC writes that about people, and none of our sources measures what a dog adds. It is reasonable to expect a dog that has been rolling in the yard to bring dirt and debris into the water, and that material gives the chlorine more to react with.

We are not printing a number for how much chlorine a dog uses up, because none of our sources publishes one. What you can do is test more often after dog swims, clean the filter as needed, and keep the salt cell producing. If the water turns hazy, start with our guide to a cloudy salt water pool. For the routine, see salt water pool maintenance and the salt cell hub.

If your dog also roams the landscaping, our page on plants around a saltwater pool covers the garden side.

When to call a vet

Call your vet if your dog has swallowed a lot of pool water, or shows any of the signs our sources list after swimming:

Hill’s also names brain damage and kidney damage as possible results of drinking larger amounts. Those are not things you can see at home, which is one more reason to call a vet early rather than wait.

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